SOLUTION: Cell membrane tonicity worksheet - Studypool - Free Printable

It looks like the image you uploaded is blurred and not clearly readable. However, based on the visible content and layout, it appears to be a biology worksheet focused on cell membrane transport, specifically tonicity and osmosis.

Let me attempt to interpret and solve the problem based on typical content in such worksheets.

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🔍 Interpretation of the Worksheet

#### Part 1: Transport Mechanism (Carrier Protein / Active Transport)

The diagram shows:
- A yellow oval representing the cell.
- Red proteins embedded in the membrane — these are likely carrier proteins.
- Green dots (molecules) moving across the membrane via these proteins.
- The process involves ATP (energy), suggesting active transport.

> ✔ Key Concept: This is active transport, where substances move against their concentration gradient using energy (ATP).

#### Fill-in-the-blanks (Based on Standard Biology Knowledge):

> "This type of transport is represented by the following process: ACTIVE TRANSPORT."
> "This process requires ATP."
> "It moves molecules from an area of low concentration to an area of high concentration."

> "The type of active transport that uses carrier proteins to move substances against their concentration gradient is called PRIMARY ACTIVE TRANSPORT."
> "The protein changes shape to move the molecule across the membrane."

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🔬 Tonicity and Osmosis Section

There are three diagrams labeled A, B, C, showing cells in different solutions:

- Diagram A: Cell shrinks → Hypertonic solution
- Diagram B: Cell swells → Hypotonic solution
- Diagram C: Cell unchanged → Isotonic solution

#### Definitions (Typical Fill-in-the-Blanks):

> - HYPERTONIC: Solution with higher solute concentration than the cell.
> - HYPOTONIC: Solution with lower solute concentration than the cell.
> - ISOTONIC: Equal solute concentration inside and outside the cell.

#### Matching Diagrams to Tonicity:

- A: Hypertonic → water leaves cell → shrinks
- B: Hypotonic → water enters cell → swells
- C: Isotonic → no net movement → normal size

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✔ Step-by-Step Answer Key

#### Part 1: Transport Mechanism

- Type of transport: Active transport
- Requires: ATP
- Direction: Against concentration gradient
- Protein involved: Carrier protein (changes shape)
- Example: Sodium-potassium pump

> ✔️ So the sentence might read:
> *"The type of active transport that uses carrier proteins to move substances against their concentration gradient is called PRIMARY ACTIVE TRANSPORT. The protein changes shape to move the molecule across the membrane."*

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#### Part 2: Tonicity and Osmosis

Fill in the blanks:

1. HYPERTONIC → solution has more solutes than the cell → cell shrinks
2. HYPOTONIC → solution has fewer solutes → cell swells
3. ISOTONIC → equal solute concentration → no change

Match diagrams:

- A: Hypertonic → cell shrinks
- B: Hypotonic → cell swells
- C: Isotonic → normal cell

> ✔️ Statement:
> *"Solution B is HYPOTONIC to Solution A. To increase Solution B’s concentration of SOLUTES so that it becomes isotonic to Solution A, you would add more SOLUTES."*

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🧠 Final Summary

| Term | Definition |
|------|-----------|
| Active Transport | Moves substances against gradient; uses ATP |
| Primary Active Transport | Uses ATP directly (e.g., Na⁺/K⁺ pump) |
| Hypertonic | More solutes outside → cell loses water |
| Hypotonic | Fewer solutes outside → cell gains water |
| Isotonic | Equal solutes → no net movement |

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💡 Tips for Students

- Osmosis = movement of water across a semi-permeable membrane.
- Tonicity refers to the relative concentration of solutes outside vs. inside the cell.
- Use the mnemonic:
> "Hypo = Happy (swells), Hyper = Hurt (shrinks)"

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If you can provide a clearer version of the image or transcribe the text, I can give a more precise answer with exact fill-ins. But based on standard biology curricula, this is the most accurate interpretation and solution.